Sofa



FIG. 1 is a front perspective view of the sofa showing my design;

FIG. 2 is top perspective view thereof;

FIG. 3 is a back perspective view thereof;

FIG. 4 is a side view thereof; and,

FIG. 5 is another side view, showing an opposite side thereof.

The broken lines shown on the sofa are understood to represent stitching. 

I claim the ornamental design for a sofa, as shown and described. 